Re: Ah, the memories....
Jamie Zawinski's classic XScreenSaver is still around, updated to work on MacOS (and still works on Linux/Unix). The BSOD mode is still there, updated to include more dead computer screens: the man page on my computer lists Windows, NT, Win2K, Win10, Ransomware, Amiga, Mac, Mac1 (another sad Mac, MacsBug (debugger screen), MacOS X, SCO, Atari, BSD, Linux, SparcLinux, HPPALinux, BlitDamage, Solaris, HPUX, Apple2, OS390, Tru64, VMS, MS-DOS, OS2, HVX, VMware, and Android. The last one is interesting as it's not really an Android screen but an HBOOT screen pretending that the boot volume has gone for a walk.